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Part1 - Yocto tutorial

Build custom linux image with yocto

#yocto   #101  

Table of Content

Elements of embedded linux#

  • Toolchain: Compiler and other tools needed to build code for target device
  • Bootloader: The program that init the board and load the linux kernel
  • Kernel
  • Root F.S: Contain all programs and libraries for our system

Yocto#

Yocto project provide tools for create custom linux distributions for any H.W

Poky#

Poky is a reference/example linux distribution create by yocto

The poky repository is an aggregation of several repositories: - openembedded-core - bitbake - meta-poky - yocto-docs

Poky = Bitback + Metadata

Note

  • Yocto is a origination like canonical
  • Poky is like ubuntu

Note

the ‘meta’ folder in the poky repository corresponds to the Openembedded Core layer, e.g. https://git.openembedded.org/openembedded-core/. OE Core includes the main components/recipes that are widely used for any configuration.

Metadata#

  • Build instructions
  • From where obtain sources
  • Changes / additions to sources

Metadata in yocto is collection of - configuration file (.conf) - Recipes (.bb and .bbappend) - Class (.bbclass) - Includes (.inc)

Note

he ‘meta-oe’ folder in meta-openembedded is another layer typically called the ‘openembedded’ layer. meta-oe contains a large amount of additional recipes.

Bitback#

  • Task scheduler

BSP: Board Support Package#

BSP is collection of information that defines how to support particular HW

  • HW futures
  • Kernel configuration
  • Additional S.W

Note

poky support by default x86, x86-64, BeagleBone devices (has BSP for each H.W type)

Reference#